<!DOCTYPE HTML>
<html>
<!--
Test changing the visibility of an <iframe mozbrowser> changes the visibility
(and thus the priority) of any <iframe mozbrowser>s it contains.
-->
<head>
  <script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
  <script type="application/javascript" src="../browserElementTestHelpers.js"></script>
  <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"/>
</head>
<body>

<script type="application/javascript;version=1.7">
"use strict";

SimpleTest.waitForExplicitFinish();
browserElementTestHelpers.setEnabledPref(true);
browserElementTestHelpers.enableProcessPriorityManager();

function runTest() {
  // Set up the following hierarchy of frames:
  //
  //   <iframe mozbrowser remote=false src='file_NestedFramesOuter.html'>
  //     <iframe mozbrowser remote=true src='file_empty.html'>
  //
  // When we change the visibility of the outer iframe, it should change the
  // priority of the inner one.

  var iframe = document.createElement('iframe');
  iframe.setAttribute('mozbrowser', true);
  iframe.setAttribute('remote', false);
  iframe.src = 'file_NestedFramesOuter.html#' + browserElementTestHelpers.emptyPage1;

  // Note that this is the process corresponding to the /inner/ iframe.  The
  // outer iframe runs in-process (because it has remote=false).
  var childID = null;
  Promise.all(
    [expectOnlyOneProcessCreated('FOREGROUND').then(function(child) {
       childID = child;
     }),
     expectMozbrowserEvent(iframe, 'loadend')]
  ).then(function() {
    // Send the outer iframe into the background.  This should change the
    // priority of the inner frame's process to BACKGROUND.
    var p = expectPriorityChange(childID, 'BACKGROUND');
    iframe.setVisible(false);
    return p;
  }).then(function() {
    var p = expectPriorityChange(childID, 'FOREGROUND');
    iframe.setVisible(true);
    return p;
  }).then(SimpleTest.finish);

  document.body.appendChild(iframe);
}

addEventListener('testready', runTest);

</script>
</body>
</html>
